Originally Posted by
sarming
They will punch holes through your expired passport. Flag all your valid visas with a postit note that says do not invalidate this visa and the visas might not get trashed.
Thailand has no problem with the visa in an expired passport, but I would not take a chance on India.
My expired passport was returned to me with ONLY the cover punched. I used my India visa from my expired passport with my current passport this past June in New Delhi with no problem. Just present both passports at immigration.